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simple regex issue

thread219-1745932

simple regex issue

simple regex issue

(OP)
Hi tek-tips.

Perl noob here, I have the following code for turning anything to lower case after 3 slashes :

CODE --> Perl

$input = 'tea/coffee/eggs/BACON'; 
$output = $input =~ s/^((?:.*?\/){3}(.*)$/$1.lc($2)/er;
print $output;

Question, how can I quickly reverse the application of lc and only apply it to $1 instead of $2? I.e. turn anything to lower case up until finding 3 slashes, once 3 slashes found do not alter the rest.

Thanks in advance.

RE: simple regex issue

I would do this in a much faster way not using regexes:

CODE --> perl

$input = 'Tea/Coffee/Eggs/Bacon'; 
@spl = split(/\//,$input,4);
map{$_=lc}@spl[0..2];
$output=join'/',@spl;
print $output;

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RE: simple regex issue

Hi

I generally agree with Franco, but in this case I would use a regular expression :

CODE --> Perl

$input = 'Tea/Coffee/Eggs/Bacon';
$output = $input =~ s!^((?:[^/]*/){3})!\L$1!r;
print $output;

Feherke.
feherke.ga

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